Earring back piece



FIG. 1 is a perspective view of an earring back piece illustrating my new design.

FIG. 2 is a front elevational view thereof.

FIG. 3 is a right side elevational view thereof.

FIG. 4 is a left side elevational thereof.

FIG. 5 is a rear elevational view thereof.

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines are included for the purpose of illustrating environment and form no part of the claimed design. 

The ornamental design for an earring back piece, as shown and described. 